Do you know the black on the solar thermometer chip is?

The traditional pointer thermometer can indicate the temperature, but the precision is low, use convenient enough, show not intuitive, the emergence of solar thermometer can let people intuitively understand how much he'd like to know what the temperature is. Solar thermometer is the use of solar energy and provide accurate temperature indicating wired sensors. Do you know how it is to receive the sunlight? In this DST2002S solar thermometer, for example, it has a bright LCD display, easy reading, display here is a black chip, it is a solar wafer, is to rely on it to receive the sun, when light levels high 100 lux will show that the temperature of the object to be tested; When the light levels drop, with a backup battery to provide power to continue to display circuit. The power switch ( OFF/ON） Equipped with can have the effect of saving electricity, more environmentally friendly.